In article ,
k wrote:
How can they legitimately be at Bank without having touched in
somewhere?

Easily: Leytonstone High Road to Blackhorse Road (via the GOBLIN)
- Kings Cross (Victoria) - Bank (Northern).

There are no validators at Leytonstone High Road and I think the
interchange between GOBLIN and Victoria is behind the gateline. If
not, then there are other places where one can change from NR to
LuL behind the gate.

--
You dont have to be illiterate to use the Internet, but it help's.